传感技术学报2016，Vol.29Issue(5)：723-728,6.DOI:10.3969/j.issn.1004-1699.2016.05.017
基于双调制随机共振的涡街信号检测方法
Vortex Signal Detection Method Based on the Dual Modulated Stochastic Resonance
摘要
Abstract
A signal processing method based on stochastic resonance applied to the vortex shedding frequency mea-surement of vortex flowmeter is studied. The relationship between signal and bistable system parameters such as threshold value and Kramers rate is discussed. The input signal is dual modulated by the signal with adjustable am-plitude and frequency to realize the matching between signal and bistable system. The simulation results manifest that the matching method is feasible and effective. The method specific to vortex signal is proposed to selecting mod-ulation parameters based on the standard deviation. The vortex signal feature is used to estimate the flow velocity and reduce the modulating parameters scope by standard deviation. Therefore,the matching efficiency between sig-nal and bistable system is improved. The experimental results indicate that the modulated method can make the vor-tex signal,especially the weak vortex signal generate stochastic resonance and effectively obtain the frequency of vortex shedding for flowrate measurement.关键词
信号处理/随机共振/信号调制/涡街流量计Key words
signal processing/stochastic resonance/signal modulation/vortex flowmeter/分类
机械制造引用本文复制引用
丁君鸿,黄咏梅,林敏..基于双调制随机共振的涡街信号检测方法[J].传感技术学报,2016,29(5):723-728,6.基金项目
浙江省自然科学基金项目(LY13E050012) （LY13E050012）
